Polypropylene has good molding processability and many methods of molding, such as injection molding, blow molding, vacuum thermoforming, coating, rotational molding, welding, machining, electroplating and foaming, and can be sprayed on the metal surface. Among them, the proportion of injection molding is large, the injection temperature is between 180-200, the injection pressure is 68.6-137.2 MPa, and the mold temperature is 40-60°C. The pre-drying temperature is about 80°C. Avoid long-term contact of PP with metal walls
The secondary processing of polypropylene is very good, its printability is better than that of polyethylene, and the printing methods such as photo-engraving, offset printing, and plano-gravure can all be used. It is necessary to obtain good printing performance such as heat resistance, oil resistance, and water resistance. , subject to corona discharge treatment and other reprint.
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